*#7370# is needed when u can press buttons (sometimes people mess their phones so far, that it's impossible to press any key or something, so the only way of formatting for them is pressing that 3-button combination)
thanatos but signing file each time is even bigger and complex method to install unsigned apps.... and also, everytime u get error ''expired certificate'' u need to change ur date back and forward to guess working one.... its so complex.... and also, if youre afraid of viruses, use any antivirus with firewall or something.... and u know one thing - there arent a lot of mobile viruses, and most of symbian users never have had deal with any virus! so, make ur choice
isma ''Sorry, your Nokia E90 does not support themes. However, feel free to look at themes compatible with other phones.'' i get this error in zedge..... so it seems your phone doesnt supports themes at all....
yes, i just asked, to make somebody else answer too... because only we post comments here but i hope, FCA will find a way, how to hack new firmware, so it will be useful for u too
im so happy 
